Pump



J. M. SHIMER PUIP June 19, 1934.

Filed Aug. 16. 1928.

INVENTOR Patented June 19, 1934 UNITED STATES PUMP John M. Shlmer, Wllkinsburg, Pa., assignor to Wilson- Snyder Manufacturing Company, a corporation of Pennsylvania Application August 16, 1928., Serial No. 300,100

2Cl8imS. (oi. 251-144) This invention relates to pumps and more particularly to pumps adapted to be used in connection with fluids containing relatively large amounts of solid material.

' 1 An object of the invention is to provide an improved valve construction for use in pumps of the type set forth.

A further object is to provide a valve mechanism of such construction and arrangement as to be capable of withstanding the destructive efiect of the solids contained in the fluid being pumped for a considerably longer period than has heretofore been possible. 1

These and other objects which will be apparent to those skilled in this particular art are accomplished by means of the invention illustrated in the accompanying drawing which shows a transverse sectional view through a valve chamber of a pump provided with a valve mechanism cons In accordance with the usual practice with matlc type being opened and closed by the alternating differential in pressure on opposite sides caused by the movement of the associated piston or plunger as will be understood by those skilled in this particular art. In the illustrated embodiment, the valve port 9 through which fluid is forced by the pump and which is alternately opened and closed by the valve mechanism is provided with an annular valve seat 10 which is forced into tight fitting engagement with the walls of the port in the usual manner. A valve 11 co-operates with they valve seat 10 for controlling the flow of fluid through the port and the valve is of general disk shape and symmetrical about an axis formed by the diameter of the disk. The peripheral edges of the disk are formed by oppositely beveled faces 12 and 13 and a groove 14 extends around the peripheral face of the disk. A ring 15 of yielding elastic material such, for example, as rubber is provided around the periphcry of the disk and has a tongue 16 co-operating with the peripheral groove 14 to properly locate the ring in position. The ring is provided with faces 17 and 18 which form extensions of and in effect complete the beveled faces 12 and 13,

pumps of this nature, the valves are of the autorespectively of the valve disk. The elasticring 15 is normally smaller in diameter than the periphery of the valve disk so that'it must be stretched materially to be placed therearound and is securely held in place by the tension thus produced.

The elastic ring 15 is provided for the purpose of insuring a fluid tight seal between the valve and valve seat so as to prevent any cutting action which would result from a small amount of leakage at high velocity caused by solid material being located between the metallic faces of the valve and valve seat when the valve is closed. It 'will be apparent that the cross section of the ring 15 when in normal condition will be sufilciently large to permit the ring 15 to have a proper cross sectional area when in stretched condition in place on the valve disk. The beveled seat engaging faces 1'7 and 18 of the ring 15 project a slight distance beyond the surfaces of the co-operating faces 12 and 13 of the disk so that when the valve closes upon the seat the elastic material engages the seat slightly ahead of the metallic portion of the valve, thus insuring complete sealing thereof and eliminating the above referred to cutting action by any possible leak. This relative size of the metallic portion of the valve and the elastic peripheral ring will be maintained throughout the life of the valve, experience having proved that the metal faces will wear away more rapidly than the faces formed of elastic material.

The valve is shown as pin guided'both atthe top and bottom. The bottom guide pin 19 extends through an opening 20 formed in a pin guide or spider 21 which is mounted in the valve seat 10. The valve guide 21 is removable from the valve seat and, as illustrated, is secured therein by a tight sliding fit, the guide and seat having co-operating shoulders 22 for properly locating the parts and for preventing the cross bar forming the guide 21 from dropping through the seat. As a result, the valve guide 21 is renewable without the necessity of renewing the associated and supporting valve seat.

The upper guide pin 23 extends through a guide opening 24 formed in the end of a hollow guide member 25 the other end' of which is snugly mounted upon a downwardly extending annular lug 26 formed on the bottom of the valve cap 8. A buffer 27 is located in the lug above the top guide pin 23 so as to alleviate the shock caused by an abnormally sudden lifting of the valve as occasionally happens in pumps of this nature. This buffer also prevents a peening of the valve 0 guide pin 23, together with crystallization of the various parts which would follow the continuous striking of the metal pin 23 on the metal valve cap. The top guide member 25 and the bottom member are secured to the lug by any suitable means such as a pin 28.

A valve spring 29 is positioned around the guide member between the valve cap and the valve disk,

the latter having grooves 30 formed in opposite faces in which the associated end of the valve spring seats. a

It is apparent that the buffer 27 in preventing peening oi. the top guide-pin insures reversibility of the valve, as any distortion of the pin would necessity of a built up or assembled structure with the resulting wear between parts.

Although I have described in specific detail one embodiment of this invention, it will be apparent that various omissions, additions, substitutions and changes can be made therein without departing from this invention or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:-

1. In combination, a reversible disc valve, and an elastic ring under tension when in place on the disk, said disc and ring having interengaging portions to position the ring on the disc, the opposite sides of the disc and ring being tapered to provide on each of said opposite, sides a substantially continuous inclined seating surface partly on the disc and partly on the ring.

2. In a pump the combination of a valve chamher, a valve seat associated therewith and having an upwardly i'acing valve engaging face, a disc valve having a downwardly facing seat engaging face and a groove on its periphery, and a peripheral ring 0! resilient material having a tongue portion entered in said groove and having a seat engaging face to form an extension of the seat engaging race of said disc, the face of said resilient ring being sheet from the associated face of said JOHN M. 8 II rm: 

